Centrifuge



F. PECHSTEIN.

CENTRIFUGE. APPLICATION FILED DEC. 18, 1919.

1,381,330. PatentedJune 14, 1921.

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, UNITED STATES PATENT OFFICE.

FRITZ PECH STEIN, OF WILMERSDORF-IBERLIN, GERMANY, ASSIGNOR TO C. A. FESCA &

SOHN, OF BERLIN-LICHTENBERG, GERMANY,

A FIRM.

Application filed December 18, 1919.

To all whom it may concern:

Be it known that I, FRITZ PnoI-Is'rmN, a citizen of Germany, and residing at lVilmersdorf-Berlin, Germany, have invented certain new and useful Improvements in Centrifuges, of which the following is a specification.

This invention relates to continuously acting centrifuges for pulps and it has for its object to provide a charging device therefor by which the material to be acted upon shall be fed into the centrifugal drum in definite quantities and at definite periods.

Centrifugal machines embodying automatic means for controlling both the feed thereto and the discharge therefrom are, generally speaking, known in the art. The present invention comprises however a particular construction, having a separate funnel above the drum of the centrifugal machine, which permits the feeding into the drum out of a large tank or other reservoir.

The accompanying drawing shows the invention as applied to a centrifuge of the kind in which the centrifugal drum can be pressed against a rotatable part of the stationary drum casing. This embodiment of the invention is represented in a sectional elevation, the charging device being for the sake of illustration, assumed to beset at an angle of 90 to the centrifugal machine.

In a footstep bearing 1 a shaft 2 can rotate that carries the centrifugal drum 3 at its upper end. To the lower end of the bearin 1 a roller is fitted to bear on a cam 4. On each rotation of the cam 4 the roller 5 will enter the recess 6 thereof so as to lower the shaft 2 and thus move the upper edge 7 of the drum 3 away from aplate 8 fixed to a tubular duct 8. This duct is mounted by means of a ball bearing 8 in a fixedly disposed cover 9 of the drum casing. By so lowering the drum shaft an annular slot is formed between the edge 7 of the drum 3 and the plate 8. Through such slot or clearance the con tents of the drum are discharged therefrom owing to the continually acting centrifugal force. The recess 6 having passed the roller 5, the drum is raised again by the circular portion of the cam & and the slot thus closed. Immediately after the contents of the drum have left it and the drum has become pressed against the plate 8, the drum Specification of Letters Patent.

Patented June 14, 1921.

Serial No. 345,664.

is recharged by the device hereafter described.

Disposed above. the centrifugal drum 8 and coaxial therewith is a funnel 10 fitted with slides 11 and 12. These are operated by either raising or lowering a rod provided with a rack 13 at its upper end. The rod 15 is adapted to slide in guides 14. The lower end of the rod 15 is connected by a link 16 with a double-armed lever 18 fulcrumed at 17. This lever carries a roller 20 that bears on a cam 19. The rack 13 is 111 gear with a toothed wheel 22 keyed on an axle 21. The sliding motion of the rod 15 will thus cause the axle 21 to rotate together with a toothed wheel 23 keyed thereon to gear with a rack 24: fitted to the, slide 11 so that the latter shall be moved by the axle 21 rotating.

The slide 12, designed to control the inlet 25 of the funnel 10, is a rotary one, carried on an arm 28 fixed to an axle 26. To one of the ends of the axle 26 a lever 28 is secured which is provided with a roller 27.

lVhenever the slide 11, which is for the outlet 29 of the funnel 10, is open, the roller 27 is resting in a horizontal groove of the slide 11. The slide 12 then is maintained in the position shown. IVhen, however, the slide 11 is moved so as to close the outlet 29 the roller 27 will enter a downward extension 31 of the groove 30 and thereby cause the slide to be rotated so as to uncover the inlet 25.

In this way, whenever the inlet 25 is open the outlet 29 will be covered, and vice versa. The opening motion of the slide 11 takes place suddenly, z'.e. the moment the roller 20 of the lever 18 enters the recess 19 of the cam 19. The closing motion of the slide 11, however, is accomplished gradually and has been finished as soon as the roller 20 has left the recess 19 of cam 19.

The cam 4:, serving to raise and lower the centrifugal drum 3, and the cam 19 designed to govern the charging device described, are mounted on the same arbor 32 and are so relatively disposed that charging and discharging shall be exactly timed for a due automatic working of the centrifuge.

I claim:

1. In a centrifuge, the combination of a centrifugal drum with a funnel above the latter, a slide controlling the inlet of such funnel, a slide controlling the outletthereinlet, and vice versa, and means for automatically discharging the contents of the said drum, substantially as set forth.

2. In a centrifuge, the combination of a centrifugal drum with a funnel above the latter, a slide cont-rolling the inlet of such funnel, a slide controlling the outlet thereof, means for operating these slides so as to cover the outlet while uncovering the inlet, and vice versa, a duct between the outlet of this funnel and the said centrifugal drum, means carrying such duct rotatably, a plate fixed to this duct to bear upon the upper edge of the said centrifugal drum and means for vertically displacing the latter, substantially as set forth.

3. In a centrifuge, the combination of a centrifugal drum with a funnel above the latter, a rotary slide controlling he inlet of such funnel, a slide controlling the ou let thereof, a groove in the latter slide, and an arm rigid with the said rotary slide, such arm engaging in said groove, substantially as set forth.

4. In a centrifuge, the combination of a centrifugal drum with a funnel above the latter, a rotary slide controlling the inlet of such funnel, a slide controlling the outlet thereof, a groove in the latter slide, an arm rigid with the said rotary slide, such arm engaging in said groove, a cam, and a gearing connecting such cam to the said outlet slide, substantially as set forth.

5; In a centrifuge, the combination of a centrifugal drum with a funnel above the latter, a slide controlling the inlet of such funnel, a slide controlling the outlet thereof, means for operating these slides so as to cover the outlet while uncovering the inlet, and vice versa, a duct-between the outlet of this funnel and the said centrifugal drum, means carrying such duct rotatably, a'plate fixed to this duct to bear upon the upper edge of the said centrifugal drum, a cam for vertically displacing the latter, a cam coaxial with the first said cam, and a gearing connecting the second said cam to the said outlet slide, substantially as set forth.

In testimony whereof, I afliX my signature in the presence of two witnesses.

FRITZ PECHSTEIN.

Witnesses CARL KREBs, FRIEDRICH BoHME. 

